Read e-book online Cereal Production. Proceedings of the Second International PDF

By E. J. Gallagher

ISBN-10: 0407003037

ISBN-13: 9780407003033

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Extra resources for Cereal Production. Proceedings of the Second International Summer School in Agriculture Held by the Royal Dublin Society in Cooperation with W K Kellogg Foundation

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That is, theoretically, an individual plant with all the most favorable genes in a population for one trait could be obtained in a single generation if a population of infinite size was used. This is not practically possible, so recurrent selection is used to gradually increase the frequencies of favorable genes until there is a reasonable likelihood of obtaining the ultimate genotype in a finite sample. 5. Genotypes at the plus end of the frequency distribution are selected and intercrossed, and progenies from the intercrosses form the cycle I population, from which the plus genotypes are selected again.

These two phases are used cyclically. g. germplasm resources, strategies for germplasm introgression and use, the role of key physiological traits in crop productivity, etc. This chapter illustrates some experiences, data, and philosophies that may have a great impact on plant breeding success for the next several decades. Gene pools The 'gene pool concept' for plant breeding was conceived by Harlan and de Wet (1971). 1). Often, the primary gene pool will include the progenitor of a crop species.

1 HPWLB -- JL jnF-'-'^lÉBi 10 A - * jaWM. ;^ -i jti 10 ι - Pi 1 50 r jy L •trvrr::-:-:-i^eB «^waSfi« 30 Β A JUL _AA 10 k. n* β& i9L_ a__ nO Sc6F2 1 30 I1 Ji Γ Π PMil _ MmA. 2 Frequency distributions for grain yield, for all generations and all crosses involving the Clintford A sativa recurrent parent and four A sterilis accessions: 1 = B442,2 = B443, 3 = B444, and 4 = B445. Black areas denote trasgressive segregates. 2. Mean productivities for seven traits measured on elite oat lines from matings of A.

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Cereal Production. Proceedings of the Second International Summer School in Agriculture Held by the Royal Dublin Society in Cooperation with W K Kellogg Foundation by E. J. Gallagher


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